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Haryana PMT Haryana PMT Solved Paper-2003

  • question_answer
    A force of \[7\hat{i}=6\hat{k}\] makes a body move on a       plane with the velocity \[3\hat{j}+4\hat{k}\] The power developed is :

    A)  \[\sqrt{45}\]                                     

    B)  45

    C)  24                                         

    D)  \[\sqrt{24}\]

    Correct Answer: C

    Solution :

                    Power developed is given by    \[=\overrightarrow{F}.\overrightarrow{v}=(7\hat{i}+6\hat{k}).(3\hat{j}+4\hat{k})\] \[=7\times 0+0\times 3+6\times 4=24\]


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